Gregory S. Holst, MD
Family Medicine Physician · Eureka, CA
Gregory S. Holst, MD is a family medicine physician with a practice address in Eureka, California, and NPI 1881601615, issued on Aug 2, 2006. Check the license (California C52586, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gregory S. Holst
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- C52586 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2675 Harris Street, Eureka, CA 95503
- Phone
- (707) 443-8335
- Enumerated
- Aug 2, 2006
- Record last updated
- Feb 15, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (707) 443-7327
- Medicaid IDs
- 84601413812 NE
01355239 CO - Medicare enrollment
- Enrolled (PECOS I20080609000232); accepts Medicare assignment
- Medical or professional school
- University Of Colorado School Of Medicine, Denver, 1995
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 2675 Harris Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Steven Korenstein, M.D.Family Medicine Physician1568776318
Verify Gregory S. Holst in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C52586Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.4 times the Medicare Part D claims of the average family medicine physician in 2024
8,648 Medicare Part D claims for 564 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 289 claims were for opioids.
Most prescribed
- Losartan Potassium626 claims
- Rosuvastatin Calcium623 claims
- Atorvastatin Calcium421 claims
- Lisinopril304 claims
- Levothyroxine Sodium253 claims
- Hydrocodone-Acetaminophen228 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Providence Medical FoundationAnaheim, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory S. Holst among 17,133 family medicine physician records in California
Gregory S. Holst, MD is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1995 · median 2005 among the 10,652 with a school on file
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
48 family medicine physician records list a practice address in Eureka
They are 48 of the 2,854 NPPES records with a practice address in Eureka, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Eureka → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Steven Korenstein, M.D.Eureka, CA 955031568776318
- Mary Meengs, M.D.Eureka, CA 955031962650358
- John Nelson, M.D.Eureka, CA 955031124029319
- Gena Pennington, M.D.Eureka, CA 955031831186501
- Martin Smukler, M.D.Eureka, CA 955031275523607
- Aisling Cooney, PAEureka, CA 955011407714942
- Joshua Echeverria, MDEureka, CA 955011578184396
- Ramir Geluz, MDEureka, CA 955011922622851
Common questions
What is Gregory S. Holst, MD's NPI number?
Gregory S. Holst, MD's National Provider Identifier (NPI) is 1881601615, issued on Aug 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory S. Holst, MD located?
The NPPES record lists a practice address at 2675 Harris Street, Eureka, CA, 95503. Phone: (707) 443-8335. Providers update this record themselves, so call before visiting.
How can I verify Gregory S. Holst, MD's license?
NPPES lists California license number C52586, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gregory S. Holst, MD prescribe under Medicare Part D?
In 2024, Gregory S. Holst, MD had 8,648 Medicare Part D claims for 564 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.